GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"16 results found.
- VLA radio detection of GRB 081221
- VLA radio observation of GRB 081221
- GRB 081221: GROND observations
- GRB 081221: Probable host galaxy in Keck imaging
- GRB 081221, Swift-BAT refined analysis
- GRB 081222: Swift XRT refined analysis
- GRB081221: Fermi GBM observation
- Swift/UVOT observations of GRB 081221
- GRB 081221: Swift-XRT Refined Analysis
- GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
- GRB 081221: Gemini-N nIR imaging
- Konus-Wind observation of GRB 081221
- GRB 081221: Enhanced Swift-XRT position
- GRB 081221: further NOT observations
- GRB 081221: NOT observations
- GRB 081221: Swift detection of a burst